#include <bits/stdc++.h>
using namespace std;
#define int long long

int N,M,K,S,T;

signed main(){
  cin>>N>>M>>K>>S>>T; S--; T--;
  if(S > T) swap(S,T);
  bool flag = (K%2 == 1);
  bool L = false;
  vector<vector<int>> G(N);
  for(int i = 0; i < M; i++){
  	int a,b; cin>>a>>b; a--; b--;
  	G[a].push_back(b);
  	G[b].push_back(a);
  	if(a == S && b == T) L = true;
  	else if(a == T || b == T) flag = true;
  	else if(a == S || b == S) flag = true;
  }
  if(flag){
  	cout << "Yes" << "\n";
  	return 0;
  }
  if(!L){
  	cout << "No" << "\n";
  	return 0;
  }
  int res = 1e18;
  vector<int> dist(N);
  for(int a = 0; a < N; a++){
    vector<int> in(N);
    vector<int> out(N);
    vector<int> col(N,-1);
  	queue<int> Q;
  	Q.push(a);
  	col[a] = 0;
  	while(!Q.empty()){
  		int now = Q.front();
  		Q.pop();
  		for(int i:G[now]){
  		  //cout << a << " " << i << " " << now << " " << col[a] << " " << col[i] << " " << col[now] << "\n";
  			if(col[i] == -1){
  				col[i] = 1 - col[now];
  				in[i] = in[now] + 1;
  				Q.push(i);
  			}
  			else{
  				if(col[i] == col[now]){
  					res = min(res,in[i] + in[now] + 1);
  				}
  			}
  		}
  	}
  }
  int ans = res;
  3+ans <= K ? cout << "Yes" << "\n" : cout << "No" << "\n";
}